This site is intended for healthcare professionals
Last reviewed dd mmm yyyy. Last edited dd mmm yyyy
Thalamic haemorrhage is usually caused by hypertension. It is associated with contralateral hemisensory loss, ataxia and minor motor weakness.
Oculomotor abnormalities include loss of vertical gaze, especially upwards; deviation downwards and inwards of the eyes at rest; hyperadduction with poor abduction in one or both eyes; and conjugate eye deviation to the side opposite the lesion or ipsilateral lesion.
Behavioural abnormalities are common. They include diminished alertness, apathy, amnesia and a reduced ability to remember new events. There may be aphasia from non-dominant hemispheric lesions. Visual neglect is rare.
Oculomotor and behavioural abnormalities are characteristic of medial thalamic involvement; sensory and ataxic abnormalities suggest ventrolateral thalamic structures. Extension into the subthalamic nucleus is suggested by hemiballismus.